Headstock for grinding machines



July 28, 1942. A. w. WIGGLESWORTH 2,291,269

HEADSTOCK FOR GRINDING MACHIN HE LIKE Filed June 20, 1941 4 Sheets-Sheet l y 1942. A. w. WIGGLESWORTH 2,291,269

HEADSTOCK FOR GRINDING MACHINES AND THE LIKE 4 Sheets-Sheet 2 Filed June 20, 1941 \V/// ww#///V/ .9 Q 5% M w fiwiili |rl.. Illl! 111 1 0% 5% R x QM Q Q Q% N k NW \w Wm MN NW \N July 28, 1942. A. w. WIGGLESWORTH 2,291,269

HEADSTOCK FOR GRINDING MACHINES AND THE LIKE Filed June 20, 1941 4 Sheets-Sheet 3 v \i w. .5 Q

l 2 I $3 a w w 1 N N L w Gs i N x u l July 28, 1942. A. w. WIGGLESWORTH HEADSTOCK FOR GRINDING MACHINES AND THE LIKE 4 ShetS -Sheet 4 Filed June 20, 1941 MUN Patented July 28, 1942 ,HEADSTOCK FOR GRINDING MACHINES AND THE LIKE Albert W. Wigglesworth, Miami Beach, Fla assignor to Hill-Clarke Machinery 00., Chicago, 111., a corporation of Illinois Application June 20, 1941, Serial No. 398,906

Claims.

This invention relates to headstocks for grinding machines and the like, and particularly to a headstock in which the spindle may be either live or dead and in which the work engaging member may be either revolvable or stationary as required for grinding different kinds of work.

One object of the invention is to provide a headstock with means for rotating the spindle, as for example in center grinding, surface grinding and internal grinding, and with means for holding the spindle stationary while rotating the work, as in plain cylindrical grinding.

Another object is to provide the headstock with interchangeable mounting plates for cooperation with diiierent forms of work holders.

The headstock herein shown and described is adapted for embodiment in universal grinders, for surface, cylindrical and internal grinding, and the spindle of the headstock may be rendered live or dead, at will, as required by the work to be ground.

In the drawings:

Fig. l is a front. elevational view of the headstock end portion of a grinding machine embodying my improved headstock.

Fig. 2 is a transverse, vertical sectional view, on an enlarged scale, taken in the plane of the line 2-2 of Fig. 1.

Fig. 3 is a longitudinal vertical sectional view through the headstock shown in Fig. 1 showing a magnetic chuck as the work holder.

Fig. 4 is a View similar to Fig. 3, but showing only the work holding end of the headstock, with a three-jaw chuck substituted as the work holding member.

Fig. 5 is a view similar to Fig. 4, showing a dead spindle for holding the work and a revolvable driver plate for rotating the work about said dead center.

Fig. 6 is a view similar to Figs. 4 and 5, showing the headstock provided with a live spindle for center grinding.

Fig. '7 is a transverse, vertical sectional view taken in the plane of the line 1-1 of Fig. 3.

In that embodiment of the invention shown in the drawings, particularly in Fig. 1, Ill indicates the grinding machine base, H the longitudinally reciprocable work carriage on which the headstock is mounted, I2 the headstock base, IS the headstock housing as a whole, M the motor supporting standard, and IS the motor and pulley housing. Reference is made to my United States Patent No. 2,112,126 of March 22, 1938, in which is shown and described one form of construction to which I have applied the invention about to be described.

Referring to Figs. 3 and '1, the headstock housing' l3 encloses the hollow spindle Hi, the bearings 11, I8 and 19 for the spindle l6, and a bearing and spindle supporting member 20. Toward the work holding end, the housing I3 is provided with an offset portion 2| of increased diameter, forming a housing for the pulley 22 which is rotatably mounted on the bearing I8 on the spindle It. A flanged guard member 23 engages the pulley housing 21 as indicated at 24 and has inwardly radially extending members 25 and 26 which are formed to accommodate an adapter plate 21.

Said adapter plate 21 is concentric with the spindle 16. It is recessed and bored as indicated at 28 to receive a coiled spring 29 and a button 30, the latter projecting through the face of the plate, and being retained by the shoulder 31 formed in the plate 21. The spring 29 bears against the button and retaining nut 32. The adapter plate-21 has a rearward offset portion 33 through which extend bolts 34 which connect the adapter plate to the pulley 22.

Abutting the face of the adapter plate 21 is a chuck mounting plate 35 to which is connected a permanent magnetic chuck 38 by bolts 31. The mounting plate 35 is screwed on the threaded end 38 of the spindle l6 until locked up against shoulder 39. Said-mounting plate 35 has a recess 40 adapted to receive the spring pressed button 30 of the adapter plate 21.

The spindle l6 and bearing iii are retained in proper longitudinal relation by the ring 4| and set screw 42.

As is understood in the art, the pulley 22 is driven by the motor in the housing If: through intermediate change speed pulleys and belts (not shown). Said pulley 22 rotatably carries the adapter plate 21 with it, and the latter rotates the chuck mounting plate 35, the chuck 36 and spindle It. In order to permit the spindle 16 to rotate with the chuck 36 and its mounting plate 355, the plunger 43 (Fig. 2) must be retracted so as to be withdrawn from the recess 44 in the spindle l8. Ths is accomplished by pulling outwardly the knob 45, thereby compressing the spring 46 between the shoulder 41 of the plunger and shoulder 48 of the sleeve 49. By turning the knob when it has been pulled outwardly, the pins will bear on the outer face of the sleeve 49 and hold the plunger 43 in retracted position, permitting the spindle to rotate.

In Fig. 4 is shown a three-j aw chuck mounting adapted for internal grinding. The pulley 22, member 23 and adapter plate 2'! provided with depressible button 30 are the same as the corresponding parts heretofore described and shown in Fig. 3, but the chuck mounting plate difiers somewhat from the mounting plate 35. Said plate 5! is screwed on the spindle threaded end 38 and is provided with a centrally located, screw threaded aperture 52 adapted. to receive a screwin water nozzle (not shown) for conveying grinding coolant to the work in internal grinding. The chuck 53 is connected by screws 53 to the mounting plate 5i. Said chuck 53 is hollow at 54 for conveying the coolant to the work, indicated at 55. The operation of the chuck 53 and spindle I6 is as heretofore described, the spindle l5 being rendered live in both of the embodiments of the invention shown in Figs. 3 and 4.

In Fig. 5 is shown an embodiment of the invention in which the spindle I6 is dead, i. e. stationary, While a work driver plate is revolving, best adapted for plain cylindrical grinding. In this construction the spindle l6, pulley 22 and member 23 are the same as heretofore described, but the adapter plate 21 has been eliminated, and the driver plate 55 is connected directly to the pulley 22 by screws 51. The plate 56 is provided on its face with a work engaging device 58. A brass thread protector ring 59 is screwed on the threads 38 of the spindle is so that its shoulder 56 looks up against the end of the spindle 16. There is some clearance between the driver plate face portion SI and the forward end of the thread protector ring 59 because the driver plate 56 revolves while the ring 59 and spindle I6 are stationary. In this embodiment, the plunger 43 is in the position shown in Fig. 2, inengagement with the recess 44 of the spindle [6. A dead center for engaging the work is indicated at 62 in Fig. 5.

The embodiment shown in Fig. 6 is a live spindle construction in which the pulley 22, member 23 and adapter plate 2! are utilized in the manner heretofore described, the adapter plate 2"! driving a driver plate 63 screwed on'the threads 33 of the spindle iii. A spanner wrench hole 66 is provided for tightening the driver plate 63 on the spindle is. There is slight clearance 65 around the tapered center 65 in the spindle I6. The shoulder 67 on plate 63 is locked up against the end of the spindle iii. The pulley 22 drives the adapter plate 27, driver plate 63, spindle l6 and center 66, this embodiment being especially adapted for center grinding.

In those embodiments of the invention adapted for live spindle operation, the adapter plate 21 is employed, together with one of several types of mounting plates and work engaging chucks or members. The mounting plate (for example, 35, 51 or 63) may be applied to the face of the adapter plate 2'! by screwing it on the spindle threads 38 until the mounting plate recess 40 engages the spring pressed button 30 on the adapter plate 21, whereupon rotation of the mounting plate continues until the mounting plate abuts the end 39 of the spindle will turn the adapter plate 27 and pulley 22 until the mounting is in its intended operative position.

Changes may be made in details of construction without departing from the scope of my invention.

I claim:

1. A headstock for grinding machines and the like comprising a housing including a cylindrical open ended portion, a hollow spindle mounted in the housing, a driven pulley rotatably mounted on the spindle within the cylindrical open ended portion of the housing, a flanged guard member engaging the open end of the cylindrical housing portion and having radially inwardly extending members spaced axially of the spindle and defining circular openings of different diameter and concentric with said spindle, work driving means including a member having concentric circular shoulder portions engaged withinsaid openings, and means connecting said member to said pulley.

2. A headstock for grinding machines and the like according to claim 1 wherein said work driving meanscomprises a driver plate secured to a free end of the spindle, and an adapter plate having driving connection with said driver plate and said pulley.

3. A headstock for grinding machines and the like comprising a housing including a cylindrical open ended portion, a spindle mounted in the housing, a driven pulley rotatably mounted on the spindle within the cylindrical open ended portion of the housing and with one face thereof adjacent said open end, a guard member engaged with the open end of the cylindrical housing portion, an adapter plate rotatably supported within the guard member and connected with the pulley, a work driver plate secured to the spindle, and a driving connection between the adapter plate and work driving plate.

4. The structure according to claim 3 wherein said driving connection comprises a button movable within a bore in the adapterlplate and engageable within a recess in the driver plate, and a spring within the bore under compression between the button and a bore closing nut for yieldably urging the button into said recess,

5. A headstock for grinding machines andthe like comprising a housing including a cylindrical open ended portion, a spindlerotatably mounted on the housing and having a free end thereof projecting beyond the open end of the cylindrical housing portion, a driven pulley rotatablyv mounted on the spindle within the cylindrical portion of the housing, a flanged guard member engaged with the open end of the cylindrical housing portionand having flanges spaced axially of the spindle and defining circular locatingseats concentric with said spindle, a work driver plate threadedly connected with the free end of the spindle, and an adapter plate having portions engaged within said seats and being connected with said driver plate and said pulley.

ALBERT W. WVIGGLES-W'ORTI-I. 

